As the solution of the definite problem,an analytical expression is obtained,which describes the changing structure in terms of diameter growth and mortality of the individual trees.
通过求解这个定解问题，得到了用单木的直径生长和枯损来描述林分结构动态变化的解析表达式。
Effects of low temperature treatment before planting on Allium sativum L.sprouting rate and secondary growth;
播前低温处理对大蒜出苗率和二次生长的影响
The random-,b&aand a-oriented zeolite membranes were obtained by the following secondary growth.
使用不同生长条件和生长液配方,在多孔氧化铝载体和氧化硅-氧化锆中间层上,原位水热合成出均匀的随机取向、a,b-轴取向和b-轴取向的晶种层,并进一步通过晶种层的二次生长,制备出随机取向、a,b-轴取向和a-轴取向的分子筛膜层。
The formation of b and a-oriented membrane with thickness of 3 μm could be ensured by the further secondary growth in a relatively mild condition.
采用原位法在多孔α-Al2O3载体表面合成出连续覆盖且b轴取向的MFI分子筛晶种层,进一步在较温和的条件下进行二次生长,获得了b、a-轴取向的膜层,厚度约为3μm。
Based on analyzing relationship between diameter increment of individual trees with tree size, competitive status, and site condition and finding out the major independent variables, the growth models for individual trees in the natural mixed forests, that have simple form, good pred.
本研究以大兴安岭地区和吉林地区天然混交林为研究对象,利用固定样地复测数据,通过分析各主要树种单木直径生长量与其自身大小、竞争和立地条件的关系,找出影响林木生长量的主要因子,并采用逐步回归技术建立了形式简洁、预估良好并便于生产应用的天然混交林各树种与距离无关的单木生长模型。
Based on analyzing relationship between diameter increment of individual trees with tree size, competitive status, and site condition and finding out the major independent variables, the growth models for individual trees of 15 species in the natural mixed forests, that have simple for.
本研究以长白山地区白河林业局天然混交林作为研究对象,采用1990年～2000年10年间复测的712块固定样地数据,通过分析各主要树种单木直径生长量与其自身大小、竞争和立地条件的关系,找出影响林木生长量的主要因子,并采用逐步回归技术建立了形式简洁、预估良好并便于生产应用的天然混交林15个树种与距离无关的单木生长模型。
The growth diameter of fungi showed that Bacillus cereus 357 produced different amount of bioactive substance depending on the culture media as well.
建立了判断对357细菌活性物质相对浓度的方法即生长直径法,同时指出,抑菌圈不能有效地反映357细菌活性物质的相对浓度。
Response of Stem Diameter Growth of Tamarix ramasissima to Changes of Space-time of Water Environment in the Lower Reaches of Tarim River
塔里木河下游多枝柽柳茎直径生长对水环境时空变化的响应
Study on Diameter Growth Model of Old Tree of Keteleeria davidiana(Bertr.) Beissn. in Three Gorges Region Dalaolin Reserve
三峡大老岭保护区铁坚油杉古树直径生长模型研究
length diameter ratio
长径比（长度与直径之比）
Study of Pretesioned Spun High Stregth Concrete Piles with Large Diameter and Length;
大直径超长PHC管桩生产技术研究
The length of such a segment.
直径长这样一段的长度
Study on Automatic Diameter Control (ADC) Technique of the Laser Crystal Growth;
激光晶体生长自动直径控制（ADC）技术研究
How much is the diameter of the sun longer than that of the earth ?
太阳的直径比地球的直径长多少?
The diameter of the sun is more than one hundred times longer than that of the earth .
太阳的直径比地球直径长一百多倍。
The length of the flagella is about1.5 times as the cell diameter.
两条鞭毛稍不等长，着生于细胞前端，鞭毛长约为细胞直径的1．倍。
Teacher: What's the relationship between the radius and the diameter of the same circle?
师：直径的长度和半径有什么关系？
Stems prostrate, internodes 1-5 cm long, ca. 1 mm diam., each nodes with 1 fine root and 2 scales.
茎匍匐，节间长1-5厘米，直径约1毫米，每节生细根1条和2枚鳞片。
Researches of One Dimensional Nano-Materials on Diameter-Controlled Synthesis, Growth Mechanisms and Physical Properties;
一维纳米材料的直径可控制备及其生长机理与物性的研究
Biology Mechanics Correlation Studies about Loop Land K-wire Diameter in Different Match in Simulating Body Lengthen Operating Condition;
模拟肢体延长工况时环与针直径不同匹配下的生物力学相关研究
Biomechanics Optimum Analysis and Selection of Dental Implant Diameter and Length According to the Classifications of Jaw Bone Abstract;
不同骨质条件下种植体直径和长度的生物力学优化分析和选择
the ratio of the circumference to the diameter of a circle.
圆周长度与圆的直径长度的比。
It measures three feet in diameter (height/length).
它的直径(高度／长度)是3 英尺。
It is about 13 meters long and 4 meters in diameter, and it weighs about 10,000 kilograms.
它长13米，直径为4米，重1万公斤。
the velocity of light is a constant.
圆的周长和直径的比是常数。